<?php

class Kd_Data_Dcl_Expression_Where_Condition_Nullable extends Kd_Data_Dcl_Expression_Where_Condition_Not {

    private $_field = NULL;

    public function __construct($field) {
        parent::__construct();
        $this->_field = new Kd_Data_Dcl_Expression_Field($field);
    }

    public function getField() {
        return $this->_field;
    }

    public function getConditionType() {
        return 'isNull';
    }

}